Fan



Filed May 9",l 1921 INVE NTUR l *NITED .STATES een..

GED E..OTI8, F MQLINE, ILLINOIS, ASSIGNOB THE HERMAN ELSON CORO BATION, O F MOLINE, ILLINOIS, A CORPDRATIQN 0F ILLINOIS.

' applicati@ mee may e, 1921. seria1 m.4es,ao1.

To all whom it may comm:

Be -it known that I, GERALD E. 0111s, a citizenl of the United States and a resident of Moline, in the county of ock Island and 5 State of Illinois, have made an invention ap.

pertaining to. Fans; and I. do'hereby declare the following to be a full, clear, and exact description of the invention, suchas will enable others skilled in the art to which `it appertains to make and use the same, reference being had to the accompanymg drawings and to the characters of. reference 4marked thereon, which-form a part of thls specification..

This invention relates to fans of .either the blowing or suction type and is partlcularly designed and intended for use in connection with ventilators of theforced draft t pe, such for instance as described and a0 c aimed in m copending application No. 459,642, filed pril 8, 1921.

The object of my invention is the provision of a fan of the character described which is cheap, simple, strong and rigid 1n its construction and capable of having) the parts thereof quickly and easily assem led, and which does not'embody the use of rivets,

, bolts or screws i11- its blade assembly. o

The invention is fully described in the t0 following specification, and while, in lts broader aspect, it is capable vof embodiment in numerous forms, a preferred embodiment thereof is illustrated in the accompanying drawings, in which,-

85 Figure 1 is a side elevation of afan embodyingthe invention. Fig. 2 is a sectional view thereof on the line 2-2 in Fi 1. Fig. 3 is a side elevation of the fan with different parts broken away and removed, and Fig.

4 is a side view of one of the blades.

Referring to the drawings, 14 designates a shaft havingl a sleeve 2 ixedly mounted thereon and forming the hub member of the fan. This sleeve is provided at its outer end, in the present instance, with an annular flange 3 to which a disk 4 is rigidly secured by rivets 5, or in any other suitable-manner.

The disk 4 is provided in e ui-distantly y spaced relation around its-perip ery with a set of inwardly extending slots 6 into which the inner edges of the blades 7 are fitted, preferably centrally of then' ends. Each blade is provided with a notch or slotl 8 at' its inner edge `adapted to yregister with' the disk slot in whichithe blade is disposed,"and to straddle the inner end wall of '.such slot. The disk 4 and blades 7 are preferably stamped from sheet-metal and' the slots 6 and 7 therein correspondin width to the gauge of the metal so that the parts are closely intertted together. The outer edges of the blades preferabl project a distance beyond the periphery o the'disk 4.

The Vblades 7 are. disposed between end rings or annular members 9, also of sheetmet-al, which in width or radial depth prefer# ably correspond to the width of the blades, j

thereby providing large central openings at each side of the fan, or of the disk 4, for the entrance of air to the fan. -The blades 7 and side rings 9 are rigidly secured together in aslmple, rigid and eiiicient manner by provid- `ing each blade at its ends with one or more integral ears or spurs 10 and providing each side member 9 with corresponding slots or openings 11 for receiving the ears 10 of a blade end. The ears are adapted to closely fit the openings 11 and t0 project throu h and beyond the same, being bent over at t e outer sides of the side members to rigidly unite the blades and side members, the ears for this purpose being of a bendable nature. In the present embodiment of the invention the blades'l 7 are shown as inwardly curved and the-side members 9 as being oppositely inclined relativel to the diametrical plane ofthe disk 4, so that the spaces between ythe side members are gradually outwardly restricted.

lt isrevident that with my fan construction the parts may be easily and quickly assembled and may be stamped from sheet steel and sheridized or galvanized after assembling to protect them andto fill them up and tighten the joints; that the manner of assembling the parts provides a rigid, cheap, durable and easily and quickly assembled construction without the use Aof rivets, bolts or the like, except in the present instance between the disk 4 and hub, and that the connotA ,struction and manner of assembling percentrally disposed slot in itsinner edge and i jecting radially pable of numerous modifications and changes without departing from .the spirit Vof the claim. f

Having thus described-my invention,`what -I claim as new anddesire to secure by Let- 'ectin slots provided vin its ,periphery'enf' J g ajset of blades Aof,

tirely'around Vthe same, y l curved form-in cross-section veach havmga vedges of the side membersV ladapted to enter Aa slot ofthe disk with its slot straddlingthe inner end wall of the disk slot, andannular side members dis- .'posed atV the 'outer ends 'of the blades in rigid stud and slot connection therewith, the side members being spaced at their inner edges from the hb and each extending outwardly at an incline to a radial plane whereby the lspaces between the members are narrowed outwardly rfrom the'inner In testimony whereof I have*` hereunto signedmy name to this specification.

, l GERALD OTIS; 

